论文标题
通过散发耦合的抗PP对称系统中的相干性增强了弱的非谐感
Enhanced sensing of weak anharmonicities through coherences in dissipatively coupled anti-PT symmetric systems
论文作者
论文摘要
在过去的几年中，已经认识到PT对称系统在感知小型扰动方面的巨大效用。在这里，我们提出了一种与耗散系统相关的替代方法，尤其是与电磁场真空结合的系统。在通常显示抗PT对称性并且不需要增益的系统中，真空吸引了两种模式之间的连贯性。由于这种连贯性，线性响应在真实轴上获得了一个极。我们证明了如何利用这种连贯性，以增强低泵速率下非常弱的弱化学性感应。另一方面，更高的驱动力（$ \ sim 0.1 $ W）生成了新的相干域。我们的结果适用于广泛的系统，我们专门说明了在弱的Anharmonic Yttrium Yttrium Iron Garnet（YIG）球的背景下，通过锥形的纤维波导与空腔相互作用。非谐度的微小变化导致诱导的自旋电流发生了很大的变化。
In the last few years, the great utility of PT-symmetric systems in sensing small perturbations has been recognized. Here, we propose an alternate method relevant to dissipative systems, especially those coupled to the vacuum of the electromagnetic fields. In such systems, which typically show anti-PT symmetry and do not require the incorporation of gain, vacuum induces coherence between two modes. Owing to this coherence, the linear response acquires a pole on the real axis. We demonstrate how this coherence can be exploited for the enhanced sensing of very weak anhamonicities at low pumping rates. Higher drive powers ($\sim 0.1$ W), on the other hand, generate new domains of coherences. Our results are applicable to a wide class of systems, and we specifically illustrate the remarkable sensing capabilities in the context of a weakly anharmonic Yttrium Iron Garnet (YIG) sphere interacting with a cavity via a tapered fiber waveguide. A small change in the anharmonicity leads to a substantial change in the induced spin current.
